Micro high-pressure air compressor

ABSTRACT

The present disclosure provides a micro high-pressure air compressor comprising a housing and an air compression mechanism and a drive mechanism mounted in the housing. The air compression mechanism is composed of a low-pressure cylinder, a high-pressure cylinder, a primary piston, a secondary piston, a piston rod and a pressure cylinder. The drive mechanism drives the piston rod to enable the primary piston and the secondary piston to perform piston movement in the annular piston chamber between the low-pressure cylinder and high-pressure cylinder and in the high-pressure cylinder respectively, so that the air is compressed in the annular piston chamber at the first stage, in the pressure cylinder at the second stage and in the high-pressure cylinder at the third stage. The present disclosure performs three-stage air compression, featuring large maximum working pressure, small size, light weight, low cost and portability.

TECHNICAL FIELD

The present application relates to a type of air compressor, more particularly, a micro high-pressure air compressor.

BACKGROUND

The air compressor is a type of device for air compression and widely applied in people's life and production. For its high compressed air pressure, the three-stage compressor is widely applied in industrial production. However, existing three-stage compressors are generally equipped with three compression cylinders and have shortcomings of large size and high weight, high cost and poor portability. Thus, they cannot be widely applied in air gun shooting and scuba diving.

SUMMARY

In response to the shortcomings in the current technology, the present disclosure provides a micro high-pressure air compressor featuring small size, light weight, low cost and portability.

The present disclosure provides a micro high-pressure air compressor, comprising a housing and an air compression mechanism and a drive mechanism mounted in the housing; the air compression mechanism including a low-pressure cylinder, a high-pressure cylinder, a primary piston, a secondary piston, a piston rod and a pressure cylinder; the high-pressure cylinder is mounted in the low-pressure cylinder coaxially, and fixed on the first end of the low-pressure cylinder to form an annular piston chamber between the low-pressure cylinder and the high-pressure cylinder; the primary piston mounted in the annular piston chamber to separate the annular piston chamber into a suction chamber and a compression chamber; the secondary piston mounted in the high-pressure cylinder; the piston rod penetrated into the low-pressure cylinder from the second end of the low-pressure cylinder; the piston rod including a sleeve and an inner rod; the sleeve of the piston rod covered on the high-pressure cylinder and connected to the primary piston; the inner rod of the piston rod inserted into the high-pressure cylinder and connected to the secondary piston; the low-pressure cylinder equipped with an air inlet of the suction chamber, an air inlet of the high-pressure cylinder and an air outlet of the high-pressure cylinder on the first end; the low-pressure cylinder equipped with an air outlet of the compression chamber at the second end; the pressure cylinder equipped with an air inlet and an air outlet; the air inlet of the pressure cylinder connected with the air outlet of compression chamber and the air outlet of the pressure cylinder connected with the air inlet of the high-pressure cylinder through the gas tube; the air inlet of the suction chamber equipped with a primary one-way valve; the primary piston equipped with a secondary one-way valve connecting the suction chamber and compression chamber; a third one-way valve mounted between the air outlet of the compression chamber and the air inlet of the pressure cylinder; a fourth one-way valve mounted between the air outlet of pressure cylinder and the air inlet of high-pressure cylinder; the air outlet of the high-pressure cylinder equipped with a fifth one-way valve; the drive mechanism driving the piston rod to enable the primary piston and the secondary piston to perform piston movement in the annular piston chamber and high-pressure cylinder respectively.

During operation, the drive mechanism drives the primary piston and the secondary piston to reciprocate in the annular piston chamber and high-pressure cylinder respectively. When the primary piston and the secondary piston move to the second end of the low-pressure cylinder, the primary one-way valve will be opened and the secondary one-way valve will be closed. Then, the external air will be sucked into the suction chamber from the primary one-way valve, and the air in the compression chamber will be compressed by the primary piston to complete the first-stage air compression in the compression chamber. After the air is compressed to a certain extent in the compression chamber, the third one-way valve will be opened and the air compressed at the first stage will continuously flow into the pressure cylinder from the third one-way valve to complete the second-stage compression in the pressure cylinder. Meanwhile, the fourth one-way valve will be opened and the air compressed at the second stage will flow into the high-pressure cylinder from the fourth one-way valve; when the primary piston and the secondary piston move to the first end of low-pressure cylinder, the primary one-way valve and the third one-way valve will be closed, and the secondary one-way valve will be opened. At the same time, the air in the suction chamber will flow into the compression chamber from the secondary one-way valve, the fourth one-way valve will be closed, and the fifth one-way valve will be opened. The air in the high-pressure cylinder will be compressed by the secondary piston to complete third-stage compression in the high-pressure cylinder. Therefore, with such structure, the application enables three-stage air compression and reaches a working pressure of 300 bar. Compared with conventional similar products, the application has advantages of compact structure, small size, low cost, light weight (8 kg approximately) and good portability.

The drive mechanism further includes a drive motor, a swing arm and a sliding block. The output shaft of the drive motor is in drive connection with the input end of the swing arm, and the sliding block is connected with the external end of the piston rod. The sliding block is designed with a swing groove and the output end of the swing arm is in slip connection with the swing groove on the sliding block. The input end of the swing arm is not on the same axis with its output end. The drive motor drives the output end of the swing arm to swing and slide in the swing groove of the sliding block and also drives the sliding block and piston rod shaft to reciprocate coaxially, enabling the primary piston and the secondary piston to reciprocate.

The housing is further equipped with a DC power socket and an AC power socket externally. The drive motor is DC gear motor; the DC power socket is in electric connection with the drive motor; the AC power socket is in electric connection with the drive motor through a power adapter. With the power adapter, the application applies to both AC power supply and DC power supply to meet the requirements of vehicle-mounted outdoor and indoor applications.

The housing is further mounted with an oil-water separator. The oil-water separator is connected with the air outlet of the high-pressure cylinder through the high-pressure condensing tube, and the oil-water separator is equipped with an external air cock and a primary liquid draining valve vertically. With the oil-water separator, the condensed oil and water are retained at the lower part of the oil-oil separator, the clean high-pressure air is outputted from the external air cock and the retained oil and water can be drained from the primary liquid draining valve.

The high-pressure condensing tube is further a threaded copper tube. The threaded structure increases the high-pressure air flow path to fully cool the high-pressure air and separate the oil and water accordingly.

The application further includes a controller. The oil-water separator is equipped with an adjustable pressure gauge. When the pressure reaches the set value of the adjustable pressure gauge, the controller will stop the drive mechanism. With such design, the outputted air pressure can be set.

The application further includes an alarm. The low-pressure cylinder is mounted with a temperature sensor on the first end. When the temperature sensed by the temperature sensor is lower or higher than the set value, the controller will trigger the alarm. With such design, the application gives an alarm in case of excessive temperature to guarantee safe operation.

The oil-water separator is further equipped with a high-pressure anti-explosion valve and the pressure cylinder is equipped with a low-pressure anti-explosion valve. With the high-pressure anti-explosion valve and the low-pressure anti-explosion valve, the anti-explosion function is provided to guarantee safe application.

The pressure cylinder is further equipped with a cotton filter internally; the compressed air flows into the pressure cylinder from the space below the cotton filter and is discharged from the pressure cylinder above the cotton filter; a secondary liquid draining valve is mounted at the bottom of the pressure cylinder. The cotton filter can filter the condensed oil and water during primary compression and secondary compression, so that the clean air flows into the high-pressure cylinder.

The housing is further mounted with a high-speed fan. The high-speed fan cools the air compression mechanism by blowing; the low-pressure cylinder is also equipped with a threaded structure at the periphery. Such structure offers good cooling effect.

This application has the following beneficial effects: During operation, the drive mechanism drives the primary piston and the secondary piston to reciprocate in the annular piston chamber and high-pressure cylinder respectively. When the primary piston and the secondary piston move to the second end of the low-pressure cylinder, the primary one-way valve will be opened and the secondary one-way valve will be closed. Then, the external air will be sucked into the suction chamber from the primary one-way valve, and the air in the compression chamber will be compressed by the primary piston to complete the first-stage air compression in the compression chamber. After the air is compressed to a certain extent in the compression chamber, the third one-way valve will be opened and the air compressed at the first stage will continuously flow into the pressure cylinder from the third one-way valve to complete the second-stage compression in the pressure cylinder. Meanwhile, the fourth one-way valve will be opened and the air compressed at the second stage will flow into the high-pressure cylinder from the fourth one-way valve; when the primary piston and the secondary piston move to the first end of low-pressure cylinder, the primary one-way valve and the third one-way valve will be closed, and the secondary one-way valve will be opened. At the same time, the air in the suction chamber will flow into the compression chamber from the secondary one-way valve, the fourth one-way valve will be closed, and the fifth one-way valve will be opened. The air in the high-pressure cylinder will be compressed by the secondary piston to complete third-stage compression in the high-pressure cylinder. Therefore, with such structure, the application enables three-stage air compression and reaches a working pressure of 300 bar. Compared with conventional similar products, the application has advantages of compact structure, small size, low cost, light weight (8 kg approximately) and good portability.

BRIEF DESCRIPTION OF THE FIGURES

To more clearly describe the specific implementation modes of the present application or the technical principles of the current technology, the figures used for specific implementation are briefly described as follows. In all figures, similar components or parts are generally identified by similar embodiments. In the figures, all components or parts are not necessarily drawn according to the actual scale.

FIG.1 is an external schematic view of the present application;

FIG. 2 is an internal schematic view of the present application (housing removed);

FIG. 3 is a schematic view of the air compressor and drive mechanism in the present application;

FIG. 4 is a section view when the primary piston and the secondary piston in the present application move to the first end of the low-pressure cylinder;

FIG. 5 is a section view when the primary piston and the secondary piston in the present application move to the second end of the low-pressure cylinder;

FIG. 6 is a section view of the pressure cylinder in the present application;

FIG. 7 is a section view of the oil-water separator in the present application.

In the figures, 1 represents the housing; 21 represents the low-pressure cylinder; 211 represents the suction chamber; 2111 represents the air inlet of the suction chamber; 212 represents the compression chamber; 2121 represents the air outlet of the compression chamber; 22 represents the high-pressure cylinder; 221 represents the air inlet of the high-pressure cylinder; 222 represents the air outlet of the high-pressure cylinder; 23 represents the primary piston; 24 represents the secondary piston; 25 represents the piston rod; 251 represents the sleeve; 252 represents the inner rod; 26 represents the pressure cylinder; 261 represents the air inlet of the pressure cylinder; 262 represents the air outlet of the pressure cylinder; 263 represents the low-pressure anti-explosion valve; 264 represents the cotton filter; 265 represents the secondary liquid draining valve; 27 represents the gas tube; 281 represents the primary one-way valve; 282 represents the secondary one-way valve; 283 represents the third one-way valve; 284 represents the fourth one-way valve; 285 represents the fifth one-way valve; 31 represents the drive motor; 32 represents the swing arm; 33 represents the sliding block; 331 represents the swing groove; 41 represents the DC power socket; 42 represents the AC power socket; 5 represents the oil-water separator; 51 represents the high-pressure condensing tube; 52 represents the external air cock; 53 represents the primary liquid draining valve; 54 represents the adjustable pressure gauge; 55 represents the high-pressure anti-explosion valve; 6 represents the temperature sensor; 7 represents the high-speed fan.

DETAILED DESCRIPTION OF THE ILLUSTRATIVE EMBODIMENTS

The embodiments of the present application are described in detail based on the figures as follows. The following embodiments are only referenced to more clearly describe the technical principles of the present application. It shall not be understood that limitation of the scope of the invention is thereby intended.

As shown in FIG. 1-6, the present disclosure provides a micro high-pressure air compressor comprising a housing 1 and an air compression mechanism and a drive mechanism mounted in the housing 1.

The air compression mechanism includes a low-pressure cylinder 21, a high-pressure cylinder 22, a primary piston 23, a secondary piston 24, a piston rod 25 and a pressure cylinder 26; the high-pressure cylinder 22 is coaxially mounted in the low-pressure cylinder 21. The high-pressure cylinder 22 is fixed on the first end of the low-pressure cylinder 21 to form an annular piston chamber between the low-pressure cylinder 21 and the high-pressure cylinder 22. The primary piston 23 is mounted in the annular piston chamber to separate the annular piston chamber into a suction chamber 211 and a compression chamber 212; the secondary piston 24 is mounted in the high-pressure cylinder 22; the piston rod 25 is penetrated into the low-pressure cylinder 21 from the second end of the low-pressure cylinder 21; the piston rod 25 includes a sleeve 251 and an inner rod 252; the sleeve 252 of the piston rod 25 covered on the high-pressure cylinder and connected to the primary piston; the inner rod 252 of the piston rod 25 inserted into the high-pressure cylinder 22 and connected to the secondary piston 24; the low-pressure cylinder 21 is equipped with an air inlet 2111 of the suction chamber, an air inlet 221 of the high-pressure cylinder and an air outlet 222 of the high-pressure cylinder at the first end; the low-pressure cylinder 21 is equipped with an air outlet 2121 of the compression chamber at the second end; the pressure cylinder 26 is equipped with an air inlet 261 and an air outlet 262; the air inlet 261 of the pressure cylinder is connected with the air outlet 2121 of compression chamber and the air outlet 262 of the pressure cylinder is connected with the air inlet of the high-pressure cylinder 22 through the gas tube 27; the air inlet 2111 of the suction chamber is equipped with a primary one-way valve 281; the primary piston 23 equipped with a secondary one-way valve 282 connecting the suction chamber 211 and compression chamber 212; a third one-way valve 283 mounted between the air outlet 2121 of compression chamber and the air inlet 261 of pressure cylinder; a fourth one-way valve 284 mounted between the air outlet 262 of pressure cylinder and the air inlet 221 of high-pressure cylinder; the air outlet 222 of the high-pressure cylinder equipped with a fifth one-way valve 285; the third one-way valve 283 of the embodiment is mounted at the air inlet 261 of the pressure cylinder, and the fourth one-way valve 284 is mounted at the air inlet 221 of the high-pressure cylinder.

The drive mechanism drives the primary piston 23 and the secondary piston 24 to perform piston movement in the annular piston chamber and high-pressure cylinder 22 respectively. Specifically, the drive mechanism includes a drive motor 31, a swing arm 32 and a sliding block 33. The output shaft of the drive motor 31 is in drive connection with the input end of the swing arm 32; the sliding block 33 is connected with the external end of the piston rod 25. The sliding block 33 is designed with a swing groove 331, and the output end of the swing arm is in slip connection with the swing groove 331 on the sliding block 33. The input end of the swing arm 32 is not on the same axis with its output end. The drive motor 31 drives the output end of the swing arm 32 to swing and slide in the swing groove 331 of the sliding block 33 and also drives the sliding block 33 and the piston rod shaft 25 to reciprocate coaxially, enabling the primary piston 23 and the secondary piston 24 to reciprocate.

During operation, the drive mechanism drives the primary piston 23 and the secondary piston 24 to reciprocate in the annular piston chamber and high-pressure cylinder 22 respectively. When the primary piston 23 and the secondary piston 24 move to the second end of the low-pressure cylinder 21, the primary one-way valve 281 will be opened and the secondary one-way valve 282 will be closed. Then, the external air will be sucked into the suction chamber 211 from the primary one-way valve 281, and the air in the compression chamber 212 will be compressed by the primary piston 23 to complete the first-stage air compression in the compression chamber 212. After the air is compressed to a certain extent in the compression chamber 212, the third one-way valve 283 will be opened and the air compressed at the first stage will continuously flow into the pressure cylinder 26 from the third one-way valve 283 to complete the second-stage compression in the pressure cylinder 26. Meanwhile, the fourth one-way valve will be opened and the air compressed at the second stage will flow into the high-pressure cylinder 22 from the fourth one-way valve 284; when the primary piston 23 and the secondary piston 24 move to the first end of low-pressure cylinder 21, the primary one-way valve 281 and the third one-way valve 283 will be closed, and the secondary one-way valve 282 will be opened. At the same time, the air in the suction chamber 211 will flow into the compression chamber 212 from the secondary one-way valve 282, the fourth one-way valve 284 will be closed, and the fifth one-way valve 285 will be opened. The air in the high-pressure cylinder 22 will be compressed by the secondary piston 24 to complete third-stage compression in the high-pressure cylinder. Therefore, with such structure, the application enables three-stage air compression and reaches a working pressure of 300 bar. Compared with conventional similar products, the application has advantages of compact structure, small size, low cost, light weight (8 kg approximately) and good portability.

In the embodiment, the housing 1 is equipped with a DC power socket 41 and an AC power socket 42 externally; the drive motor 31 is 12V DC gear motor; the DC power socket 41 is in electric connection with the drive motor 31; the AC power socket 42 is in electric connection with the drive motor 31 through a 220V/110V-12V power adapter. With the power adapter, the application applies to both AC power supply and DC power supply to meet the requirements of vehicle-mounted outdoor and indoor applications.

In the embodiment, the housing 1 is mounted with an oil-water separator 5. The oil-water separator 5 is connected with the air outlet 222 of the high-pressure cylinder through the high-pressure condensing tube 51, and the oil-water separator 5 is equipped with an external air cock 52 and a primary liquid draining valve 53 vertically. With the oil-water separator 5, the condensed oil and water are retained at the lower part of the water-oil separator 5, the clean high-pressure air is outputted from the external air cock 52 and the retained oil and water can be drained from the primary liquid draining valve 53. The high-pressure condensing tube 51 in the embodiment is a threaded copper tube, so the high-pressure air flow path can be increased to fully cool the high-pressure air and separate the oil and water accordingly.

The embodiment also includes a controller and an alarm. The oil-water separator 5 is equipped with an adjustable pressure gauge 54. When the pressure reaches the set value of the adjustable pressure gauge 54, the controller will stop the drive mechanism. With such design, the outputted air pressure can be set. The low-pressure cylinder is mounted with a temperature sensor 6 at the first end; the controller triggers the alarm to act when the temperature sensed by the temperature sensor 6 is higher than or lower than the set value. The alarm is actually a buzzer to give an alarm at a high temperature, a low pressure or a high pressure, guaranteeing safe operation.

In addition, the oil-water separator 5 is further equipped with a high-pressure anti-explosion valve 55 and the pressure cylinder 26 is equipped with a low-pressure anti-explosion valve 263. With the high-pressure anti-explosion valve 55 and the low-pressure anti-explosion valve 263, the anti-explosion function is provided to guarantee safe application. The pressure cylinder 26 is equipped with a cotton filter 264 internally; the compressed air flows into the pressure cylinder 26 from the space below the cotton filter 264 and is discharged from the pressure cylinder 26 above the cotton filter 264; a secondary liquid draining valve 265 is mounted at the bottom of the pressure cylinder 26. The cotton filter 264 can filter the condensed oil and water during primary compression and secondary compression, so that the clean air flows into the high-pressure cylinder 22. The housing 1 is mounted with a high-speed fan 7 internally; the high-speed fan 7 cools the air compression mechanism by blowing; the low-pressure cylinder 21 is also equipped with a threaded structure at the periphery to provide good cooling effect.

It shall be noted that, the embodiments above are only referenced to illustrate the technical principles of the present application and no limitation of the scope of the invention is thereby intended; although the embodiments above are referenced to give a detailed illustration, it shall be understood that, any alterations and further modifications in the described embodiments, and any further partial or whole equivalent replacements of the technical principles of the invention as described herein as would normally contemplated by those skilled in the art to which the invention relates can be made; these modifications or replacements shall not cause a deviation of corresponding technical principles of the invention from the range as described in the embodiments, and shall cover the range of the claims and description above. 

1. A micro high-pressure air compressor comprising a housing and an air compression mechanism and a drive mechanism mounted in the housing, characterized in that, the air compression mechanism includes a low-pressure cylinder, a high-pressure cylinder, a primary piston, a secondary piston, a piston rod and a pressure cylinder; the high-pressure cylinder is mounted in the low-pressure cylinder coaxially, and fixed on the first end of the low-pressure cylinder to form an annular piston chamber between the low-pressure cylinder and the high-pressure cylinder; the primary piston is mounted in the annular piston chamber to separate the annular piston chamber into a suction chamber and a compression chamber; the secondary piston is mounted in the high-pressure cylinder; the piston rod is penetrated into the low-pressure cylinder from the second end of the low-pressure cylinder; the piston rod includes a sleeve and an inner rod; the sleeve of the piston rod is covered on the high-pressure cylinder and connected to the primary piston; the inner rod of the piston rod is inserted into the high-pressure cylinder and connected to the secondary piston; the low-pressure cylinder is equipped with an air inlet of the suction chamber, an air inlet of the high-pressure cylinder and an air outlet of the high-pressure cylinder on the first end; the low-pressure cylinder is equipped with an air outlet of the compression chamber at the second end; the pressure cylinder is equipped with an air inlet and an air outlet; the air inlet of the pressure cylinder is connected with the air outlet of compression chamber and the air outlet of the pressure cylinder connected with the air inlet of the high-pressure cylinder through the gas tube; the air inlet of the suction chamber is equipped with a primary one-way valve; the primary piston is equipped with a secondary one-way valve connecting the suction chamber and compression chamber; a third one-way valve is mounted between the air outlet of the compression chamber and the air inlet of the pressure cylinder; a fourth one-way valve is mounted between the air outlet of pressure cylinder and the air inlet of high-pressure cylinder; the air outlet of the high-pressure cylinder is equipped with a fifth one-way valve; the drive mechanism drives the piston rod to enable the primary piston and the secondary piston to perform piston movement in the annular piston chamber and high-pressure cylinder respectively.
 2. The micro high-pressure air compressor according claim 1, characterized in that, the drive mechanism includes a drive motor, a swing arm and a sliding block; the output shaft of the motor is in drive connection with the input end of the swing arm; the sliding block is connected with the outer end of piston rod; the sliding block is designed with a swing groove and the output end of the swing arm is in slip connection with the swing groove on the sliding block.
 3. The micro high-pressure air compressor according to claim 2, characterized in that, the housing is equipped with a DC power socket and an AC power socket externally; the drive motor is DC gear motor; the DC power socket is in electric connection with the drive motor; the AC power socket is in electric connection with the drive motor through a power adapter.
 4. The micro high-pressure air compressor according to claim 1, characterized in that, an oil-water separator is mounted on the housing; the oil-water separator is connected to the air outlet of the pressure cylinder through a high-pressure condensing tube; the oil-water separator is equipped with an external air cock and a primary liquid draining valve vertically.
 5. The micro high-pressure air compressor according to claim 4, characterized in that, the high-pressure condensing tube is a threaded copper tube.
 6. The micro high-pressure air compressor according to claim 4 further comprising a controller, characterized in that, the oil-water separator is equipped with an adjustable pressure gauge; the controller will stop the drive mechanism when the pressure reaches the set value of adjustable pressure gauge.
 7. The micro high-pressure air compressor according to claim 6 further comprising an alarm, characterized in that, the low-pressure cylinder is mounted with a temperature sensor on the first end; the controller triggers the alarm to act when the temperature sensed by the temperature sensor is higher than or lower than the set value.
 8. The micro high-pressure air compressor according to claim 4, characterized in that, the oil-water separator is equipped with a high-pressure anti-explosion valve, and the pressure cylinder is equipped with a lower-pressure anti-explosion valve.
 9. The micro high-pressure air compressor according to claim 1, characterized in that, the pressure cylinder is equipped with a cotton filter internally; the compressed air flows into the pressure cylinder from the space below the cotton filter and is discharged from the pressure cylinder above the cotton filter; a secondary liquid draining valve is mounted at the bottom of the pressure cylinder.
 10. The micro high-pressure air compressor according to claim 1, characterized in that, the housing is mounted with a high-speed fan internally; the high-speed fan cools the air compression mechanism by blowing; the low-pressure cylinder is also equipped with a threaded structure at the periphery. 